The Revit Structure 2012 Updates are available from the Autodesk website for download. Specify a language preference and it will direct you to the appropriate link. It is important that all users install the updates.
You can apply this Update to Revit Structure 2012 running on all supported operating systems and languages. Consult the readme file for installation instructions and additional details on the primary issues resolved by this update. Make sure that you install the correct update (32-bit or 64-bit) for your software and operating system.
Updates are not a full install, they are using service pack technology similar to Autocad based products.
Update 2 English– September 2011
Autodesk_Revit_Structure_2012-x86_Update-2 (exe - 250 MB)
Autodesk_Revit_Structure_2012-x64_Update-2 (exe - 180 MB)
Note: The service pack can be applied to both the standalone and suite versions of Autodesk Revit Structure 2012.
Autodesk_Revit_Structure_2012Update_2_Content (zip - 105 MB)
Note: The update release content is included within the update release executable; however the cabinet file can be used to manually update content posted to a shared location.